// 获取该月的天数
export const getDaysInMonth = (year, month) => {
    const day = new Date(year, month + 1, 0)
    return day.getDate()
}

// 创建日期 yyyy-MM-dd 格式， 用于创建非当前月的日期
export const handleCrateDate = (year, month, start, end, type) => {
    const arr = []
    if (type === 'prev') { // 上一月
        if (start === end) return []
        const daysInLastMonth = getDaysInMonth(year, month - 1) // 获取上一个月有多少天
        for (let i = daysInLastMonth - end + 2; i <= daysInLastMonth; i++) {
            arr.push({
                date: parseTime(new Date(year, month - 1, i)),
                isCurMonth: false
            })
        }
    } else if (type === 'rear') { // 下一月
        for (let i = start; i <= end; i++) {
            arr.push({
                date: parseTime(new Date(year, month + 1, i)),
                isCurMonth: false
            })
        }
    } else { // 本月
        for (let i = start; i <= end; i++) {
            arr.push({
                date: parseTime(new Date(year, month, i)),
                isCurMonth: true
            })
        }
    }
    return arr
}
export function parseTime(time, cFormat) {
    if (arguments.length === 0 || !time) {
        return null
    }
    const format = cFormat || '{y}-{m}-{d}'
    let date
    if (typeof time === 'object') {
        date = time
    } else {
        if ((typeof time === 'string')) {
            if ((/^[0-9]+$/.test(time))) {
                // support "1548221490638"
                time = parseInt(time)
            } else {
                // support safari
                // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
                time = time.replace(new RegExp(/-/gm), '/')
            }
        }

        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000
        }
        date = new Date(time)
    }
    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    }
    const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
        const value = formatObj[key]
        // Note: getDay() returns 0 on Sunday
        if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
        return value.toString().padStart(2, '0')
    })
    return time_str
}
